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BAXTER D. WHITNEY, OF WIN CHEN DON, MASSACHUSETTS.

Letters Patent No. 60,812, dat-col January 1, 1867,

IMPROVEMBNTIN PLANING-MACHINS.

TO ALL WHOMIT MAY GONCERN:

:Be it known that I, BAXTER D. WHITNEY, of Winchendon, in the county of Worcester, and State of Massachusetts, have invented certain new and useful Improvements for Preventing Pitch and other Gummy Substances from Sticking to the Feed-Rollers in Planing-Machines and the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, making a part of this specification, in which- Figure `1 shows a cross-section through the revolving cutter, and the series of the feeding-rollers.

Figure 2 shows a side elevation through the connecting-gear-wheels todrive the feed-rollers'. l

The object of my invention is to prevent the accumulation of pitch, or any gummy substance from the wood or shavings, on the surface of the presser feed roller or rollers, which press upon the board, after the action of the' cylinder planer upon it, such accumulation causing indentationsin the planed surface, which units it for nice work. My invention consists in making the size of the back-pressure feed-roll or rolls, or the size of the gear-wheel which drives them, so as to give the surface of the roll or rolls a greater or less motion than the front feed-rolls and lumber to be planed, thus causing the back roll or rolls to slip a trifle on the planed surface, and thereby preventing any accumulation on the rolls, to cause indentations in the planed wood.

To enable others skilled in the art to make and use my invention, I will describe it more fully, referring to the drawings and to the letters of reference marked thereon. y

The revolving cutting apparatus A, and the feeding-rollers B and C, are constructed and geared together with cog-wheels b and c, in the ordinary manner. Back of the revolving cutter A, is arranged the presser feedroller D, and driven by the spur gear-wheel 0l, and intermediate wheel c. For the purpose of effecting a ,very important and desirable result in planing and dressing lumber to be used for painted, varnished, and polished work, I make the roller D'a trifle larger in diameter than the other feed-rollers, B and C; or if the rollers are all made of the same diameter, the same result can be effected by making the spur gear-wheel d one or more cogs smaller or larger, so that the roller D, which presses on the planed surface of the wood, will run a trie faster or slower than the front feed-roll and surface of the board travels, thereby causing a constant slipping on the planed part of the board, so as to e'ectually prevent the gum from the wood, or any'other adhesive substance, i

from accumulating on the surface of the roll, to indent' and deface the planed surface in any manner. I make the smooth rolls for my planing-machines of hardened metal, which does not wear so fast, and are susceptible of being made smoother, and are moreeasily kept clean by this arrangement, although rolls made of ordinary metal are kept clean by operating in manner above described.

Having thus fully describedl my inventionl I claim having the size of the back-pressure feed-roll' or rolls, or the size of the gear-wheels thatl drive them, such as will give the surface of the roll or rolls a trifle greater or less motion than the frontfeed-rollsand lumber to be planed have, thus causing the back roll or rolls to slide a trie on the planed surface, thereby preventing any substance from adhering and accumulating on the rolls. y

' BAXTER D. WHITNEY.

Witnesses:

WM. MUnnocK, B. R. DAY. 

